21v^2-18v=0

Solution for 21v^2-18v=0 equation:

Simplifying
21v2 + -18v = 0

Reorder the terms:
-18v + 21v2 = 0

Solving
-18v + 21v2 = 0

Solving for variable 'v'.

Factor out the Greatest Common Factor (GCF), '3v'.
3v(-6 + 7v) = 0

Ignore the factor 3.
Subproblem 1
Set the factor 'v' equal to zero and attempt to solve:

Simplifying
v = 0

Solving
v = 0

Move all terms containing v to the left, all other terms to the right.

Simplifying
v = 0
Subproblem 2
Set the factor '(-6 + 7v)' equal to zero and attempt to solve:

Simplifying
-6 + 7v = 0

Solving
-6 + 7v = 0

Move all terms containing v to the left, all other terms to the right.

Add '6' to each side of the equation.
-6 + 6 + 7v = 0 + 6

Combine like terms: -6 + 6 = 0
0 + 7v = 0 + 6
7v = 0 + 6

Combine like terms: 0 + 6 = 6
7v = 6

Divide each side by '7'.
v = 0.8571428571

Simplifying
v = 0.8571428571
Solution
v = {0, 0.8571428571}